Derrick-car.



PATENTED APR. 17, i906v S. P. MITCHELL.

DERRICK GAR.

APPLICATION FILED OCT. 28, 1904.

12 SHEETS-SHEET l fiilll i ifil WITNESSES: (O 5 9 gflwwM PATENTED APR. 1'7, 1906.

S. P. MITCHELL,

DERRICK CAR.

APPLICATION FILED 0CT.28,1904.

12 SHEETS--SHEET 2.

INVEN UI? ATTORNEY,

N0. 8 7,862. PATENTED APR.1'7, 1906.

S. P. MITCHELL. DERRICK GAR.

APPLICATION FILED 0GT.28,1904.

12 SHEETS-SHEET 3v 68 In a WITNESSES: 11/5/41 .5 $19M ,4 TTOIM EY.

No. 817,862. PATENTED APR. 1'7, 1906. S. P. MITCHELL. DERRICK GAR.

APPLICATION FILED OGT.28 1904.

12 SHEETV-SHEET 4.

INVENTOR 5 m 11 TTUB/VEY.

PATENTED APR. 17, 1906 8. P. MITCHELL.

DERRICK GAR.

APPLICATION FILED OGT.28,1904,

l2 SHEETS-SHEET WITNESSES PATENTED APR. 17, 1906.

S. P. MITCHELL.

DERRICK CAR.

APPLIOATION FILED 0012a, 1904.

12 SHEETS-SHEET G.

wvmron 0am 7 9 [id/a4 ATTOPHEJ PATENTED APR. 17, 1906.

S. P. MITCHELL.

DERRICK OAR.

APPLICATION FILED 0GT.28, 1904.

12 SHEETS-SHEET 7,

WI TIJESSES Wm/ N0. 817,862. PATENTED APR. 17, 1906. S. P. MITCHELL.

DERRICK OAR.

APPLICATION FILED 0OT.28, 1904.

12 SHEETS-SHEET a.

WI T/VESSES No. 817,862. PATENTED APB. 1'7, 1906. S. P. MITCHELL.

DERRICK GAR.

APPLICATION FILED OOT.28,1904.

12 SHEETBSHEET 9.

WWW/mm.- m?

mu g W A TWMJEV.

No. 817,862. PATENTED APR. 17, 1906. S. P. MITCHELL.

DERRICK GAR.

AIPLIUA'IION mum 001228, 11104,

12 SHEETS-SHEET l1 H N M T T A No. 817,862. PATENTED APR. 17, 1906v S. P. MITCHELL.

DERRICK GAR.

APPLICATION FILED OGT.28,1904.

12 SHEETS-SHEET 12.

WITNESSES: [NYE/{TOR 773 MW/ 3- #9 Ma. Mf Mill,

UNITED PATENT OFFICE DERRICK-CAR.

Specification of Letters Patent.

Patented April 17 1906.

Application tiled October 28, 1904:. Serial NO. 230,377.

Be it known that LSAiii'iii. l. MI'I(IIELL,& citizen of the lnitcd States, residing at Philadcl ihia, county of Philadelphia, and State of Pennsylvania, have invented certain-lin- )rovenients in l)cii'ick-(ais,of whichthe following is a specification.

This invention comprises a derrick of peculiar construction and extended capacity carried by a specially designed car having mechanism adapted for operating both the derrick and the car.

The characteristic features comprise in general improved means for balancing and lift ing very heavy loads, which can be picked up and moved from or to any position in l'rontor on either side of the car, for readily manipulating the load byqiower wherever it may require to be picked up or moved to, for proielling the car and carrying the derrick with its load by the motor for operating the derrick, for quickly assembling or dissociating and stownig on the car the parts of the derrick, and for providing facility for stowing the tools of the operating crew.

Features of improvement are provided in the special construction of the car, which affords convenient compartments for stowing tools and parts of the derrick as concomitants of structural provisions for supporting and effecting the operation of the derrick.

Further features of improvement are found in the special construction of the boom and its connections, of the mast and its connections, and of the motor and its special connections for moving the mast, booms, loads, and car.

The further features of improvement will be found in the following description and the acco-m anying drawings of the invention.

In t e accompanying drawings, Figure 1 represents a side view of a derrick-car embodying improvements of my invention. Fig 2 is a side view of the outer end of the main boom and its connections. Fig. 3 is a sec tional view taken on the line 3 3 of Fig. 1. Fig. 4 is a plan view of the car and A-frai'ne mast having the cross-head thereon. Fig. 5 is an end view showing the framing of the cab. Fig. 6 is a front view of theA -frame mast and parts connected therewith. Fig. 7 is a side view, and Fig. 8 is an end view, of the truck and the end of the strut for raising and lowering the mast. Fig. 9 is a front view, artially in section, taken on the line 9 9 of ig.

10, showing in detail the construction of the mast. Fig. 10 is a top lan view, partially in section, taken on the inc 1() 10 of Fig. 9, showing in detail the construction of the mast. Fig. 11 is a side view of broken sections, showing in detail the construction of the mast. Fig. 12 is a sectional view taken on the line 12 12 of Fig. 9. Fig. 13 is a sectional view taken on the line 13 13 of Fig. 9. Fig. 14 is a side view of the bearings connected to the car-bolster for supporting the lateral booms and counterbalancing beams. Fig. 15 is an end view of-the lower bearing, shown in Fig. 14. Fig. 16 is a plan, and'Fig. 17 is a side, view of the outer end of the main boom. Fig. 18'is a plan, and Fig. 19 is a side, view of the inner end of the main boom. Fig. 20 is a sectional view taken on the line 20 20 of Fig. 17. Fig. 21 is a sectional View taken on the line 21 21 of Fig. 16. Fig. 22 is a sectional view through the splice in the main boom, taken on the line 22 22 of Fig. 16. Fig. 23 is a plan view of the bails and an end view of the main boom to which they are coupled. Fig. 24 is afront view, partially in section, showing a bail connected with the top of the mast. Fig. 25 is a side, and Fig. 26 is a front, view of a swiveled tackle-block carried by the mast. Fig. 27 is a plan view of a compound trunnion pin for roviding a swivel connection between the b ock and the mast. Fig. 28 represents a side elevation of the for ward end of the car and the main boom supported in its lowered position. Fig. 29 is a plan, and Fig. 30 is a side, view of the bearing for connecting the main boom to the car. Fig. 31 is a side view, partially in section, of the pin by which the main-boom bearing is pivotally connected to the car. Fig. 32 is a plan view of the forward end of the car. Fig. 33 is a sectional view taken on the line 33 33 of Fig. 32. Fig. 34 is a sectional view taken on the lines 34 34 of Fig. 32. Fig. 35 is a sectional view taken on the lines 35 35 of Fig. 32. Fig. 36 is a plan view of a hoisting-engine for operating the car and derrick. Fig. 37 is a vertical sectional view of two drums that may be used in place of a main drum and the auxiliary drum shown in Fig. 36. Fig. 38 represents a side view of a drum and ratchet mechanism, shown in section in Fig. 37 Fig. 39 is a sectional view taken on the line 39 39 of Fig. 40, showing mechanism operated by the hoisting-engine for propelling the car. Fig. 40 is a side view, and ig-41 is a sectional view illustrating the mechanism for propelling the car. Fig. 42 represents a plan IIO view, and Fig. .43 represents a side elevation.

of the lever mechanism for operating the clutches: and Fig. 4-4 is a diagrammatic plan l view,and Fig. -15 is a diagrannnatic side view.

- of the mechanism for operating thc'trnch for the intermediate sill sections channels.

8, which combines with the plates 7 to pro- 1 vide compartments 9 for holding tools.

These compartments connnnnicate with the tool-compartments it) of the tool-box superstructures comprising the walls It and the doors 12 and 13. The plate 3, the walls 11, andthe cover 14 thereon'forni a chamber 15, in Which the main boom 16 may be placed when desired.

Rails 17 are fixed on the superstructure to provide a track for a truck 18, which is controlled by cables 19, passing over the sheaves 20, the truck being fixed to the track iii-any position desired by passing bolts 21 therethrough and through the rails, Figs. 8, 44, and 45.

The holster 22 comprises the transverse web-plates 22 connecting the center sills,

and 22", connecting the sills on either side of.

the center, and the cover-plates 22,the-several parts bemg-connected tcgether, as shown,

-by angles 22, 22 22", and 22.

A bearing 23, having the lug 23 thereon,

is pivotally connected to the holster by the pin 24 passing therethrough. The pin is held in place by the cotter 26, having the lugs 26 thereon for engaging its seat 24 in the pin and the spring 26" for holding it in place. The lug 23 rec Eves the bifurcated inner end of the boom'l6, whose lugs 16 are pivotally connected thereto by the pin 25 passing therethrou gh. .VVhen the boom is lowered to the horizontal position, where it may be supported at its outer end by the bent 26, the pin 24 can be drawn readily and the bearing 23 held rigidly to the/boom by passing a pin through the holes 23 therein and 16 in the boom. If-nowthe car he moved forward, the boom will pass into the chamber 15 for stowing it, the rollers 16" and 16 on the boom carrying, it sn'ioothly into the chamber, Figs. 3, 18, 2s, 30, and 31.

The boom structure is peculiar in character, having an intermediate part of uniform cross-section and ends of irregular cross-section tapering in form. The box construction employed .for takin up the compression and bending strains is ormed by the use in the middle section of ordinary regular channels 16", connected together by plates 16",

riveted to the flanges thereof, and by the use in the end sections of tapered channels Hi, connected together by the tapered plates to", riveted thereto, the channels lti" being pressed steel shapes. The splice bet ween the middle and end sections is made by staggering the joints between th channels Hi" and lo" on either side of the boom and leaving spaces lo between the plates lb and to". through which to work inside of' the boom in riveting or bolting the inner splice-plates lfi and the outer splice-channels Hi, the openings being subsequently closed by riveting or bolting splice-plates lfi to the flanges ol' the The upper face of the boom has placed between the cllanncbflanges the filling-piece 19", of wood to provide a smooth upper surface and prevent wear on the tacklelines. The outer scction is-provided with the shackles 16" for handling the boom. and the end carriesthe t tickle-sheaves lti"and 16". mounted on the pin 16*. projecting on either side of the boom, Figs. [(5 to 23.

Angles 27 are fixed to the bolster 22, and the outer angles thereof are reinforced by the plates 28 of the bearings 28 to provide bearings for the A-frame mast 29, embracing the feet 29 on the legs 29" thereof, pins 30 passing through the bearings and feet to pivot allv connect them together, Figsflt) to 15.

he feet of the mast have forwardly-pro jecting toes 29", through which and the bolster 22 pins 29 may be passed to hold the frame in the vertical position, the pins being disengaged when it isdesired to use the frame in a lower position or to fold it down.

The-A-frame, of box construction, has its legs 2.9 connected by the head 29 and the struts 29". The legs are composed of channels 29, having plates 29 and gussets 29 riveted to the flanges thereof, the gussets having inwardly-projecting flanges for connecting the struts 29 The head comprises the bent channels 29 and 29 respectively, re-

the anges thereof and braced by the struts 29 and 29*. The joints formed by the abutting-channt-tls of the legs and head are staggered, and open sections 29 are left between the cover-plates to iermit access to the interior for riveting channel splice-plates 29" and channels or bent plates 29, the openings being thereafter closed by plates riveted to the channel-flanges. Beams 30, pinned to the head of the A-fran1e, provide a cross-head which may be supported on either side by struts 31, connected thereto by pins 32 and to bearings 33 by ins 34, the bearings being fixed to the legs of the frame. Bearings 35, fixed to the cross-head, have pin connections 36, with back legs 37, connected by bolts 38 to the angles 39, tixedto the side sills, Figs. 1, 4, and 8.

' The eye-plates 40, fixed in the ends of the cross-head, are respectively adapted for carrying a link 41, which supports a tackleblock 42 for carrying a line 43, which moves a tackle-block 44, the latter being connected by a link 45 and a bail 46 with a pin 47, pass- .ing through a lateral boom 48. The pm 47 carries a bail 49 and a link 50, which support a tackle-block 51, connected with a tackleblock 52 by a line 53. oted on a pin 54, passing therethrough and through the flanges of one of the bearings 55, which are held on the bearings 28 by pins 56. The bearings 28 are respectively adapted for engaging a counter-beam 57, connected thereto by a pin 58 and supported at its outer end by a pin connection 59 with the tie-rod 60, having a pin connection 61 with the crosshead. A weight 62 may be connected to the outer end of the counter-beam in lieu of an anchorage to balance the load handled by the lateral boom 48.v It is to be understood that this mechanism contemplates the use of a lateral derrick on each side of the car at the same time when desired.

The top of'the A-frame carries a pin 63, which passes through a gooseneck 64 for the engagement of guy rods 65, anchored to bars 66, fastened to side sills on either side of the cab 67, the guy-rods bein composed of linkswhich'permit them to fo d to ether on lowering the A-frame, Figs. 1, 3, an 4.

A swlvel-block 68 is sleeved on the pin 63 and is provided with trunnions 68, which engage the bail 69, having its members 69* bent inward and braced by a spreader 69 The bail is connected b a pin 70 with the top ing fall-block 71, w 'ch carries the line 72 or moving the block 73. The latter is connected by a pin 74 with the bail 75, en gaged by the pin 16 in the end of the main oom, the members 75 of the bail being drawn together and braced b the spreader 75 The pin 16 also carries the bail 76, having its parallel members 76 drawn together and united to form a shackle 7 6 the whole bei forged in an integral piece and the shackle being braced b a spreader 76, Fi s. 1, 2, 6, 23, and 24. A ink 77, carried by t ebail 76, supports a block 78, which carries the line 79 for moving the block 80 of the lifting-tackle formed thereb A tackle-block 81 carries the lines 72 an 79. This block has its cheekpiece lugs 81 connected totrunnions 82 of a compound trunnion or swivel pin 82, the swivel-pin havin trunnions 82 journaled in bearings 8, whic are connected by bolts 84 with a strut 29. A The swivel-pin is forged in a single piece with trunnions at right an les to each other to permit the block to oscil ate freel upon either axis. It will be seen that this fil tached by removing the bolts 84 and the block and bearings can be readily fixed toether for convenience in handling by assmg a pin through the holes 81 of the b ock- The boom 48 is pivock and its bearings can readily be de-- lugs and 83 of the bearings, Figs 1, 25, 26, and 27.

Bearings 85, fixed to the A-fra'me, have pin connections 86 with the strut 87, which is connected by pins 88 with the truck 18, the A-frame being supported and adjusted thereby. The lines 19 connect the truck-clevises 18 and the block 89, which runs in channels 90, fixed on either side of the chamber 15. This block being moved b a line 91, which is fixed to the movable block 89, passes around the sheaye 89 thereof and 92 of the stationary block 92 and thence to a drum of the hoisting-engine, Figs. 1, 3, 7, 8, 44, and 45.

The engine is carried on the I-beams 93, which rest on a cab-floor extended laterally beyond the side sills for providin additional room. The engine being a modi cation of a usual type of hoisting-engine has the drums 94 and 95 suitable for operating the top ing fall and load lines for themain boom an the spools 96 and 97 on either side for operating t e topping fall and load lines of the auxiliary booms. T o operate the truck for the A- frame, there may be connected to the usual engine an auxiliary drum 98 for controlling the line 91, which operates the block 89.

. The drum 98 is sleeved to rotate on the shaft 99, journaled in bearings 100 and driven from the shaft 101, carrying the drum 94, the shaft 99 having a sprocket 102 fixed thereon, which is connected with the sprocket 103, fixed on the shaft 101 by a chain 104, Fig. 36. To fix the drum 98 to the shaft 99, the friction-clutch 105 is fixed on the shaft and the drum is moved to throw its corresponding clutch 98 into enga ement therewith. To shift the drum, a ro 106 moves longitudinally in the shaft 99, having a pin 107, which engages the drum and reciprocates in the slot 108 of the shaft. To reciprocate the rod 106, a fulcrumed lever 109 enga es a reduced portion 106 thereof, journale in the lever.

In the construction of the engine I may substitute the mechanism shown in Figs. 37 and 38 for the drum 94. In this case the shaft 101 carries the drums 110 and 111. The drum 1 10 is loose on the shaft and is engaged therewith by providing it with a frictional clutching member 110, which ma be thrust into enga ement with a corresponding clutchingmem er 112*, carried b the spur-wheel 112, fixed to the shaft, the rum being automatically unclutched in any usual manner, as by the thrust of a spring 113. The speed of rotation of the drum may be regulated by the usual brake-band 114, operating on the cylindrical surface 110 and the drum maybe held stationary by engaging the usual ratchet-wheel 1 10, fixed thereto. The drum 11 1 is mounted to rotate freely and to be held against lon 'tudinal movement on a sleeve 115, spline on the shaft 101, so that it may be moved longitudinall and held against rotation thereon. On t e sleeve is keyed a ITS ratchet-wheel 116, to which the drum 111 may be enga ed by a pawl 111 thereon. The ratchet-w eel carries a collar 116*, which may be engaged by a lever for moving the wheel, the drum, and the sleeve lon itudinally on the shaft 110, the movement 0 the sleeve against the hub of the drum causing it to be clutched to the wheel 112. The speed of. the drum 111 is regulated by the usual brake-band 117, which operates on the cylindrical surface 111 thereof.

The spur-wheels 112 and 118 are engaged and driven by the pinion 119 on the journaled shaft 119 through the usual crank 120 thereon and driving-rod 121. Engaging with the spur-wheel 112 is a inion 122 which meshes with a pinion 123, Died on the journaled shaft 124, the shaft having a pinion 125 fixed thereon, Figs. 40 and 41. The spur-wheel 112 also engages the pinion 126, which engages a pinion 127, loose on a revoluble shaft 128, having a pinion. 129 fixed thereon, the pinion 129 engaging a pinion 130, fixed 011 a journaled shaft 133, havin the spur-wheel 131 and the sprocket 132 fixe thereon. The spur-wheel 131 meshes with a spur-wheel 134, fixed on a journaled shaft 135, having the spurwheel 136 loose thereon. The sprocket-wheel 132 is connected by the procket-chain 137 with the sprocket wheel 138, fixed on the truck-axle 1 39, through which the car is propelled. The'shaft 133 is journaled in han ers 140, fulcrumed on the bearings 141, an the hangers are moved to tighten or loosen the chain 137 by a link 142, ivoted thereto and to a lever 143, having t e journal 144, Figs. 39, 40, and 41.

To ropel the car in the rearward direction, t e clutch 145 on the shaft 135 is oper-- ated to engage the pinion 136 to the shaft when the sheave 132is revolved by the spur- Wheel '112 acting through the pinions 122, 123, 125, 136, 134, and 13.1 and to propel the car forward the clutch 146 on the shaft 128 is o erated to engage the pinion 127 to its sl iaft when the sheave is revolved in the 0pposite direction by the spur-wheel 112 acting through the pinions 126, 127,129, and 130.-

To operate the clutches of well-known type their respective collars and 146*- are moved on the respective shafts 135 and 128 by levers 147 and 148, engaged therewith and having the fulcrums 149 and 150. These levers are connected to ether by a rod 151 and operated by a cran 152, thrown by a rod 153 and a lever 154.

It will now be understood that the car, with the derrick thereon, can be moved from lace to place by the motor that elevates and Powers the mast and operates the tackles for moving the three booms and the loads lifted thereb The truck and strut connected with t e mast can be moved to and held at the position desired, whether for fully elevating or lowering it or holding it at such inclined position as may be required for pass ing under a bridge or liftin with a lowered top. The main and lateral ooms, which are stowed on the car and readily assembled or dissociated by reason of their bearings and pin connections, can be simultaneously oper ated, if desired, and admit of operations about the car throughout the greater part of the arc of a circle. The peculiar construction of the mast affords great strength and stiffness and, with the cross-head and the members that support it, provides a stable structure for liftin and balancing heavy loads regardless of t eir positions. The fie- .culiar construction of the car-bolster is required for supporting the mast, the booms, and the beams,;and the construction of the body, while affording the necessary strength and space, provides advantageous means for stowing the apparatus. The method of splicing the parts joined in the mast and in the main boom permits the production of the solid box construction required for providing practically uniform strength, avoiding the weakness that usually obtains where access to the interior must be had for connecting splicing members. The strut for use as the main boom has peculiar advantages by reason of its construction and shape, providin the necessary resistance to compression an bending strains and affording facility for making connections therewith, and it is to be understood that a like construction and shape may be employed for a mast or otlier use suitable therefor. It will be understood that the construction of this strut permits the 'ih'sertion or removal of sections for regulating the length very readily, since the splice that is used gives the strength of a jointless construction that is otherwise required to obtain the desired resistance to strains, and with the splice either one or several interm'ediate sections may be employed.

. Having described-"my invention, I claim- 1. In apparatus of the class described, a car, a mast having its foot fulcrumed on the body of said car, a boom having its foot fulcrumed in relation to said car, a strut having a fulcrumed connection to said mast and a movable foot, and means on said car for controlling the movable foot of said strut to lower said mast, substantially as specified.

2. In ap 'aratus of the class described, a car, a trac thereon, 'a truck movable on said track, a mast having its lower end fulcrumed on said car, a strut fulcrumed to said mast and supported by said truck, and" a boom connected to said mast and having its foot fulcrumed in relation thereto, substantially as specified p 3. In a paratus of the class described, a car, a trac thereon, a truck on said track, a pin passing through a member of said truck and a rail of sai track, an A-frar'ne mast having its feet fulcrumed onsaid car, a strut erases fulcrumed to said truck and mast, and a boom connected to said mast and fulcrumed in relation thereto, substant ally as specified.

4. In apparatus of the class described, a car, an A-frame mast. having its feet fulcrumed on said car, a movable truck, a strut having fulcrumed connecti n. to said mast and truck, folding guy-rods connecting tle top of said mast with opposite sides of said car, and a boom connected to said mast, substantially as specified.

5. In apparatus of the class described, an A-frame having a box construction comprising a pair of channels having staggered ends, cover- .lates secured to the flanges of said channe s and having ends staggered with reference to the ends of said channels, a second pair of channels having staggered ends registering with said first channel ends, coverplates secured to the flanges of said second pair of channels, a space or spaces between said first and last named cover-plates, splicing members secured to said channels interior and exterior thereto, and a cover plate or plates secured to said flanges over said aperture or apertures, substantially as specified.

6. In apparatus of the class described, an A-frame having legs comprising channels, coverlates secured to the flanges of said channe s, a head comprising bent channels registering with said first channels and forming staggered joints therewith, cover-plates for said head-channels, an aperture between said cover-plates for access to the interior of said joints, splice-plates for said joints within said structure, and a cover-plate for said aperture, substantially as specified 7. In apparatus of the class described, an A-frame having legs comprising webs with flanges thereon, cover and gusset plates se cured to said flanges, a head comprisinga re-- inforced web with flanges thereon and coverlates connected with said last P named anges', and struts connecting said gussetplates, substantially as specified.

8. In apparatus of the class described, an A-frame having horizontal and vertical apertures through the feet thereof, pins passing through said apertures, bearings having apertures through which said pins pass, and means for supporting said frame independently of the pins passing vertically through said feet and bearings, subsi antially as specified.

9. In apparatus of the class described, a car-bolster, a bearing, a pin by which said bearing is fulcrumed on said bolster, a boom fulcrumed on said bearing, a bearing secured to an end of said bolster, a boom fulcrumed on said bearing, and a mast to which each of said booms is connected, substantially as specified.

10. In ap aratus of the class described, a car-bolster, bearings at each end of said bolster, a boom adapted to be fulcrumed on a bearing at one end of said bolster, a counterbeam adapted to be fulcrumed on a bearing at the othcrcnd of said bolster, and a mast adapted to be connected With said boom and counter-beam, substantially as specified.

11. In apparatus of the class described, a bolster, a counter-beam bearing connected with said bolster at each end thereof, and a boom-bearing having a pin connection with each of said counter-beam bearings, substantially as specified.

12. In apparatus of the class described, a mast, a bearing for. the foot of said mast, a

pin connecting said mast and foot, a second bearing engaged by said pin, and a beam fulcrumed on said second bearing, substantially as specified.

13. In apparatus of the class described, a mast, bearings for the feet of said mast, pins connecting said bearings and feet, bearings supported by said pins adapted for fulcruming a beam, bearings sup orted by said second bearings adapted for ulcruming a boom, and pins for fulcruming said last-named bearings to said second bearings, substantially as specified. I

14. In apparatus of the class described, a car having a set of sills and a superstructure carried by said sills, said superstructure com prising tool-com artments and a longitudinal boom-chain er between said compartments, substantially as specified.

15. In apparatus of the class described, a car having a set of sills, a superstructure comprising a len itudinal chamber, and a boom which said'dhamber is adapted to receive, substantially as specified.

16. In apparatus of the class described, a car, a track carried thereby, a truck movable on said track, a second track carried by said car, a block movable on said last named track and connected with said truck, and a block connected with said movable block, substantially as specified.

17. In apparatus of the class described, a car, a track carried thereby, a truck movable on said track, a strut supported by said truck, a second track carried by said car, a block connected with said truck and movable on said second track, a motor carried by said car, and a block and line connectin said motor with said first block, substantial y as s ecified.

18. In apparatus of the class escribed, a car, a mast having a fulcrum connection with said car, a main boom having a fulcrum connection with said car, a pair of auxiliary booms having fulcrum connections with said car, tackle mechanisms for operating independently each of said booms and their respeetive loads, and a motor having separate mechanisms for operating each of said tackle mechanisms independently, substantially as specified.

19. In apparatus of the class described, a truck, a movable block connected with said truck, a track on which said block runs, a stationary block, a drum, and a line connecting said drum with said blocks, substantially as specified.

20. In ap )aratus of the class described, a car, a derric k thereon, an engineconnected with and operating said derrick, a Wheel connected with an axle of said car, a train of gears and a clutch mechanism for connecting said engine and Wheel for moving said car in one direction, and a separate train of gears and clutch mechanism for connecting said engine and Wheel and moving said car in the opposite direction, substantially as specified.

21. In apparatus of the class described, a car, a derrick thereon, a motor connected with and operating said derrick, asprocket- Wheel connected With an axle of said car, a journaled shaft and a sprocket-Wheel thereon, a chain connecting said sprocket-wheels, a pair of pinions on said shaft, two trains of gears for connecting said motor with said pinions, said gear-trains driving in op osite directions, and clutching mechanism or disengaging either gear-train While engaging the other, substantially as s ecified.

22. In apparatus of t c class described, a car, a mast supported by said car, a main boom connected with said mast and supported by said car, and a lateral boom connected with said mast and having means connecting it with said car whereby it is adapted to move vertically and horizontally on the side thereof, substantially as specified.

23. In apparatus of the class described, a car, a mast comprising connected upright members fulcrumed in relation to said car, a main boom fulcrumed in relation to said car, a lateral boom fulcrumed in relation to said car, ,and means for counterbalancin said lateral boom, substantially as s ecifie 24. In apparatus of the c ass described, a car, a mast comprising a plurality of connected upright members fulcrumed in relation to said car, a strut for supporting said mast, a main boom fulcrumed in relation to said car, a lateral boom fulcrumed in relation to said car, and means for counterbalancing said lateral boom, substantially as specified.

In testimony whereof I have hereunto set my hand, this 26th day of October, A. D. 1904, in the presence of the subscribing witnesses.

SAMUEL P. MITCHELL. In presence of- THOMAS S. GATES, UTLEY E. CRANE, Jr. 

